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- W2146431965 abstract "Abstract Recent advances in the knowledge of the evolutionary status of asymptotic giant branch (AGB) stars and of the nucleosynthesis processes occurring in them are discussed, and used to interpret abundance determinations for s-process elements, lithium and CNO isotopes in several types of AGB stars. We focus our attention mainly on carbon-rich AGB stars. By combining these different constraints we conclude that most carbon stars in the solar neighborhood are of low mass ( M ≤3 M ⊙ ), their abundances being a consequence of the operation of thermal pulses and the third dredge-up. However, the observed abundances in carbon stars of the R and J types cannot be explained by this standard scenario. These stars may not be on the AGB, but possibly in the core-He burning phases; their envelopes may have been polluted with nuclear ashes of the core-He flash, followed by CNO re-processing enhancing 13 C. Observational evidence suggesting the operation of non-standard mixing mechanisms during the AGB phase is also discussed." @default.
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- W2146431965 date "2003-01-01" @default.
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- W2146431965 title "Understanding AGB Carbon Star Nucleosynthesis from Observations" @default.
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- W2146431965 doi "https://doi.org/10.1071/as03021" @default.
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